C++中try｛｝catch｛｝

#include <iostream>
using namespace std;

int main()
{

 char *pdata;
 size_t count = ~static_cast<size_t>(0)/2;
 try
 {
  pdata = new char[count];
  cout << "Memory allocated." << endl;
 }
 catch(bad_alloc &ex)
 {
  cout << "Memory allocation failed." << endl
    << "The information from the exception object is:"
    << ex.what() << endl;
 }

 delete []pdata;

 return 0;
}